Grinding tool for reseating gate valves



J. c. HENDRICK 2,351,124

GRINDING TOOL FOR RESEATING GATE VALVES June 13, 1944.

Filed May 22, 1943 Patented June 13, 1944 GRINDING TOOL FOR RESEATING GATE VALVES John 0. Hendrick, Wichita, Kans.

Application May22, 1943, Serial No. 487,993

2 Claims.

This invention relatesto a grinding tool for reseating gate Valves, and has for its principal object to 'reclaim said valves which otherwise may be salvaged or discarded.

Another object of this invention is to provide an inexpensive tool that is easily placed in the valve body. the grinding element of the tool having a simple and eflicient means to retain the same accurately mounted on the annular seat of the valve and a stem and power means to turn the said grinding disc.

A further object of this invention is to provide .a removable connection for the stem to the grinding disc that will function as a universal joint as the annular seats of the valve slant from a transverse plane of the axis flow line of the valve, these being a pair of said annular seats spaced apart and oppositely positioned with respect to their slant and the said tool being adapted to grind the seats by entering the stem at the flow line side opposite the seat to be ground and the grinding disc to be reversed accordingly.

A still further object of this invention is to provide a grinding tool that may be manually or machine operated, the tool being quickly installed and efiicient in its performance.

These and other objects will hereinafter be more fully explained, reference being had to the accompanying drawing forming a part of this specification, and in which like characters will apply to like parts in the difierent views.

Referring to the drawing:

Fig. 1 is a cross section through the valve body, the stem, packing gland and gate being removed for convenience of illustration.

Fig. lA is a reduced View of the valve body looking into the gate receiving side of the valve. Fig. 2 is a top plan view of the grinding disc.

Fig. 3 is an edge view of the disc and being positioned to illustrate its entry into the valve body in Fig. 1, the line of travel and its position on one of the annular seats being shown by dotted lines, also the turning stem, one view of which is axial of the valve flow line, the other being at right angle to the valve seat on which the disc is operatively positioned that is also shown by dotted lines.

Fig. 4 is an elevation of the tool, the disc being in section diametrically, the stem having a T bar for manual operation.

Fig. 5 is a transverse fragmentary view of Fig. 4.

Fig. 6 is an elevation of the tool having its stem connected to the chuck of drill press to operate the tool, the machine except the chuck being removed from the drawing.

As a more concise description of the tool and its mode of installation to grind the annular seats of a gate valve, it will be seen that the said gate valve as illustrated in Figs. 1 and lA consists of a body portion comprised of a pair of hollow hubs I, axially aligned and extending oppositely and each being threaded internally to be engaged by the threaded ends of adjacent pipes of a pipe line, the latter not shown in the drawing, said body also having a hub 2 centrally connected and being at right angle to the axis of first said hubs, the latter named hub being internally threaded to engage a gland and stem to actuate the gate of the valve, said gland, stem and gate omitted from the drawing to avoid confusion and to clearly illustrate the possibility of inserting a grinding disc 3 0f the tool, the disc of which is of a lesser diameter than the interior of the elongated valve portion as at A that is transverse to the first said hubs as shown in Fig. lA to permit free entry of the disc through the said path A of the gate as said disc will not enter through the annular seats. The tool consists of a stem 4, the upper end of which maybe gripped by the jaws of a chuck 5 that is machine driven or it may be engaged by a T-handle or wheel 6 for manual operation. The lower end of the stem is flattened to seat in an eye B concentrically positioned in the upper side of the disc, the eye being arced inward and centrally apertured as at C to receive a spur D outwardly extending and being axially aligned with the stem and adapted to rock in the aperture as the disc is turned by the stem. Furthermore the end of the stem slants outward and upward from the spur to permit rocking movement longitudinally of the eye and the side walls of the said eye slant outward divergently, whereby said disc is free to wabble in all directions when turned by the stem; should the stem extend at right angles from the disc as shown by dotted lines E in Fig. 1, the wabble above referred to will not occur, but such will take place should the stem be rocked to a position as shown by dotted lines F.

To retain the disc in working relation to the annular seats, it will be seen that a circular extension is provided on the lower side thereof whereby an annular shoulder G is formed to engage Within the opening of seats while turning the disc. Of course it will be understood that a suitable grinding paste will be applied to the seat to resurface the same for fluid tight engagement with the sides of the gate when the latter is forced therebetween by its threaded stem and wheel control.

While I have shown and described a disc as a grinding element through the medium of a suitable paste-like substance, I do not wish to be restricted to such medium alone, as the contacting face of the disc with the valve seat may be provided with'an abrasive surface to resurface the valve seat. Furthermore the stem and its connection with the disc may be varied, and such other modifications may be employed as lie within th scope of the appended claims.

Having fully described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a' grinding tool for reseating gate valves, a circular disc, a shoulder formed on one side of the disc inward of its periphery as registering means for the disc on the annular seat of a gate valve, the other side of the disc having a slotted eye concentrically positioned therein, the side walls of the eye diverging outward and the said eye having an aperture centrally positioned and extending through the disc, a stem having one end portion flattened and having a spur axially extending from its flattened portion, the spur and its adjacent end of the stem to engage the eye and aperture simultaneously as centering and turning means for the disc.

2. In a grinding tool for reseating gate valves, a circular disc, a shoulder formed on one side of the disc inward of its periphery as registering means for the disc on the annular seat of a gate valve, the other side of the disc having a slotted eye concentrically positioned therein, the side ,walls of the eye extending each way a short distance from the diametrical axis of the disc, the bottom of the eye being arced inward and the said eye having an aperture centrally positioned and extending through the disc, a stem having one end portion flattened and having a spur axially extending from its flattened portion, the spur and its adjacent end of the stem to engage the eye 20 and aperture simultaneously as centering and 

